Roofing-cement



PATENT OFFICE.

v WM. T. DE GOLYER, OF SOHENEOTADY, NEW YORK.

ROOFING-CEMENT.

Specification forming part of Letters Patent No. 19,627, dated March 16, 1858.

To all whom it may concern:

Be it known that 1, WM. T. DE GOLYER, of the city of Schenectady and State ofNew York, have invented a new and Improved Method of Preparing a Chemical Roofing, of which the following is a full and correct description.

The nature of the invention consists in preparing a roofing material or compound which is elastic and extensible to a certain degree in the middle and lower portions thereof, while the upper or exterior portion is made of metallic matter, which by oxidizing expands and fills up the pores of the exterior coating, and at the same time becomes itself insoluble in water, so that an elastic and substantial root is formed, not liable to leak nor to crack, nor (alter seasoning) to communicate any taste to the water which runs from it.

I prepare the basis of my roofing by saturating canvas with oil or mineral tar heated to 400 of Fahrenheits thermometer, and immediately sprinkling over it, on both sides, as much pulverized hydraulic cement as will be absorbed or adhere thereto, and then run the canvas so charged between strongly-compressing rollers, which makes a strong and durable foundation. Ordinary coal-tar may be used for this purpose, and any hydraulic cement used for building purposes may be used for preparing the canvas. The canvas thus prepared is nailed upon the roof in the usual way, the nails being first dipped inthe tar before being driven into the root. Next the canvas is to be well covered with a coat of tar, or tar mixed with naphtha in the cold state, made thin enough to be laid on with a brush till the whole is thoroughly covered. Next I sprinkle or otherwise spread over the freshly-coated surface a layer of finely-pounded iron turnin gs or cuttings evenly to the depth of a quarter of an inch in thickness, rubbing or rolling it in, so as to thoroughly mix the metal turnings with the last coating of tar in the lower portion,where the two come in contact. The roof is then allowed to remain exposed to the weather till the iron has thoroughly rusted, requiring a longer or shorter period, according to the dryness or dampness ot' the season or, in case it should be a very dry season, a few wettings and dryin gs of the root in successive days will sufficiently rust the iron. When sufficiently' rusted I cover the whole roof with a coat of hydraulic lime mixed into a thin mortar With brine. This pasty mass works into the cavities of the iron turnings and makes a smooth surface, which is smoothed down with a trowel or other suitable instrument.

When the above coat is sufficiently dry and hard it is brushed over with a finishing coat of the tar and left to harden by ordinary exposure. V

The advantages gained in the iron-cement roofing are: It protects the prepared foundation from the atmosphere and from extracting the elasticity, which is necessary to be retained to protect it from cracking.

Having thus described the nature of the invention and the method of making and using the same, I would remark that I am aware that it is not new to saturate canvas with tar and earthy matter to form a chemical roofing thereby; nor is it a new thing to mix iron filings or turnings with salt and water, or lime and water and salt, to make acement to unite iron pipes, or even to form a chemical roofing, when such roofing contains no elastic basis to prevent cracking. I disclaim, therefore, all these devices.

What I claim, and desire to secure by Letters Patent, is-- Combining an elastic basis consisting oftar, canvas, and earthy matter, as set forth, with a superimposed coat of iron-turnings filled in with earthy matter, in the manner and for the purpose herein. set forth.

WM. T. DE GroLYER.

.Witnesses:

F. G. VRooMAN, O. H. POWELL. 

